Scanner Drive - Ricoh JP5000 Service Manual

SCANNER AND OPTICS 1 July, 1998

2.1.2 SCANNER DRIVE

[H]
Rear
[G]
[C]
[B]
[E]
[D]
[G]
[A]
Front
[F]
[E]
C229D095.WMF
A stepper motor drives the scanner. The scanner drive motor [A] drives the 1st and
2nd scanners [B, C] through the timing belt [D], scanner drive pulley [E], scanner
drive shaft [F], and two scanner wires [G].
- Book mode -
The scanner drive board controls and operates the scanner drive motor. In full size
mode, the 1st scanner speed is 42.33 mm/s during scanning. The 2nd scanner
speed is half that of the 1st scanner.
In reduction or enlargement mode, the scanning speed depends on the
magnification ratio (M: 0.50 to 2.00). The returning speed is always the same, in
both full size and magnification modes. Changing the scanner drive motor speed
changes the image length in the sub-scan direction. Image processing on the MPU
board accomplishes reduction and enlargement in the main scan direction.
SP6-011-1 changes the motor speed and therefore adjusts the magnification ratio
in the sub-scan direction.
- ADF mode -
During scanning, the scanners are always in their home positions (when the
scanner H.P sensor [H] detects the 1st scanner). The ADF motor feeds the original
through the ADF. In reduction/enlargement mode, changing the ADF motor speed
changes the image length in the sub-scan direction. Magnification in the main scan
direction is done on the MPU board, in the same manner as book mode.
SP6-011-2 changes the ADF motor speed and therefore adjusts the magnification
ratio in the sub-scan direction.
2-2